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                    performWork
            
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                    updateSuspenseComponent
            
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                    updatePortalComponent
            
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                    updateFragment
            
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                    commitPlacement
            
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                    commitAllLifecycle
            
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                                <div class="api-method"><div class="api-method-definition"><h1 id="performwork">performWork</h1><p><code>performWork</code>&#x901A;&#x8FC7;&#x4E24;&#x79CD;&#x65B9;&#x5F0F;&#x8C03;&#x7528;</p><h5 id="performasyncwork-&#x5F02;&#x6B65;&#x65B9;&#x5F0F;">performAsyncWork &#x5F02;&#x6B65;&#x65B9;&#x5F0F;</h5><p>&#x5F02;&#x6B65;&#x60C5;&#x51B5;&#x7ED9;<code>performWork</code>&#x8BBE;&#x7F6E;&#x7684;<code>minExpirationTime</code>&#x662F;<code>NoWork</code>&#xFF0C;&#x5E76;&#x4E14;&#x4F1A;&#x5224;&#x65AD;<code>dl.didTimeout</code>&#xFF0C;&#x8FD9;&#x4E2A;&#x503C;&#x662F;&#x6307;&#x4EFB;&#x52A1;&#x7684;<code>expirationTime</code>&#x662F;&#x5426;&#x5DF2;&#x7ECF;&#x8D85;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x8D85;&#x65F6;&#x4E86;&#xFF0C;&#x5219;&#x76F4;&#x63A5;&#x8BBE;&#x7F6E;<code>newExpirationTimeToWorkOn</code>&#x4E3A;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#xFF0C;&#x8868;&#x793A;&#x8FD9;&#x4E2A;&#x4EFB;&#x52A1;&#x76F4;&#x63A5;&#x6267;&#x884C;&#x5C31;&#x884C;&#x4E86;&#xFF0C;&#x4E0D;&#x9700;&#x8981;&#x5224;&#x65AD;&#x662F;&#x5426;&#x8D85;&#x8FC7;&#x4E86;&#x5E27;&#x65F6;&#x95F4;</p><h5 id="performsyncwork-&#x540C;&#x6B65;&#x65B9;&#x5F0F;">performSyncWork &#x540C;&#x6B65;&#x65B9;&#x5F0F;</h5><p>&#x540C;&#x6B65;&#x65B9;&#x5F0F;&#x4E45;&#x6BD4;&#x8F83;&#x7B80;&#x5355;&#x4E86;&#xFF0C;&#x8BBE;&#x7F6E;<code>minExpirationTime</code>&#x4E3A;<code>Sync</code>&#x4E5F;&#x5C31;&#x662F;<code>1</code></p><h5 id="&#x5177;&#x4F53;-performwork">&#x5177;&#x4F53; performWork</h5><p>&#x9996;&#x5148;&#x8981;&#x901A;&#x8FC7;<code>findHighestPriorityRoot</code>&#x627E;&#x5230;&#x4E0B;&#x4E00;&#x4E2A;&#x9700;&#x8981;&#x64CD;&#x4F5C;&#x7684;<code>root</code>&#xFF0C;&#x4F1A;&#x8BBE;&#x7F6E;&#x4E24;&#x4E2A;&#x5168;&#x5C40;&#x53D8;&#x91CF;</p><p>&#x8FD9;&#x91CC;&#x5224;&#x65AD;&#x662F;&#x5426;&#x6709;<code>deadline</code>&#x6765;&#x5206;&#x6210;&#x4E24;&#x79CD;&#x6E32;&#x67D3;&#x65B9;&#x5F0F;&#xFF0C;&#x4F46;&#x6700;&#x5927;&#x7684;&#x5DEE;&#x8DDD;&#x5176;&#x5B9E;&#x662F;<code>while</code>&#x5FAA;&#x73AF;&#x7684;&#x5224;&#x65AD;&#x6761;&#x4EF6;&#xFF0C;&#x6709;<code>deadline</code>&#x7684;&#x591A;&#x4E86;&#x4E00;&#x4E2A;&#x6761;&#x4EF6;<code>(!deadlineDidExpire || currentRendererTime &gt;= nextFlushedExpirationTime)</code></p><p>&#x6211;&#x4EEC;&#x5148;&#x6765;&#x770B;&#x76F8;&#x540C;&#x7684;&#x90E8;&#x5206;</p><pre><code class="lang-js">nextFlushedRoot !== <span class="hljs-literal">null</span> &amp;&amp;
  nextFlushedExpirationTime !== NoWork &amp;&amp;
  (minExpirationTime === NoWork ||
    minExpirationTime &gt;= nextFlushedExpirationTime)</code></pre>
<p>&#x4E0B;&#x4E00;&#x4E2A;&#x8F93;&#x51FA;&#x8282;&#x70B9;&#x4E0D;&#x662F;<code>null</code>&#xFF0C;&#x5E76;&#x4E14;&#x8FC7;&#x671F;&#x65F6;&#x95F4;&#x4E0D;&#x662F;<code>NoWork</code>&#xFF0C;&#x540C;&#x65F6;<em>&#x8D85;&#x65F6;&#x65F6;&#x95F4;&#x662F;<code>NoWork</code>&#xFF0C;&#x6216;&#x8005;&#x8D85;&#x65F6;&#x65F6;&#x95F4;&#x5927;&#x4E8E;&#x4E0B;&#x4E2A;&#x8282;&#x70B9;&#x7684;&#x8D85;&#x65F6;&#x65F6;&#x95F4;</em>&#xFF0C;&#x4E00;&#x822C;&#x6765;&#x8BF4;<code>minExpirationTime</code>&#x5E94;&#x8BE5;&#x5C31;&#x7B49;&#x4E8E;<code>nextFlushedExpirationTime</code>&#x56E0;&#x4E3A;&#x4ED6;&#x4EEC;&#x6765;&#x81EA;&#x540C;&#x4E00;&#x4E2A; root&#xFF0C;<code>nextFlushedExpirationTime</code>&#x662F;&#x5728;<code>findHighestPriorityRoot</code>&#x9636;&#x6BB5;&#x8BFB;&#x53D6;&#x51FA;&#x6765;&#x7684;<code>root.expirationTime</code></p><p>&#x5728;&#x975E;&#x5F02;&#x6B65;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x63A5;&#x4E0B;&#x53BB;&#x5C31;&#x662F;&#x5FAA;&#x73AF;&#x6267;&#x884C;<code>performWorkOnRoot</code>&#x7136;&#x540E;&#x518D;&#x627E;&#x4E0B;&#x4E00;&#x4E2A;&#x4F18;&#x5148;&#x7EA7;&#x7684;<code>root</code>&#x6267;&#x884C;</p><p>&#x800C;&#x5728;&#x5F02;&#x6B65;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#x591A;&#x4E86;&#x4E00;&#x4E2A;&#x5224;&#x65AD;<code>(!deadlineDidExpire || currentRendererTime &gt;= nextFlushedExpirationTime)</code>&#xFF0C;&#x4EC0;&#x4E48;&#x610F;&#x601D;&#x5462;&#xFF1F;<code>deadlineDidExpire</code>&#x662F;&#x7528;&#x6765;&#x5224;&#x65AD;&#x65F6;&#x95F4;&#x7247;&#x662F;&#x5426;&#x5230;&#x671F;&#x7684;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;<code>deadline</code>&#x4E2D;&#x8BBE;&#x7F6E;&#x7684;&#xFF0C;&#x800C;&#x7B2C;&#x4E8C;&#x4E2A;&#x6761;&#x4EF6;&#x662F;<em>&#x5F53;&#x524D;&#x6E32;&#x67D3;&#x65F6;&#x95F4;&#x662F;&#x5426;&#x5927;&#x4E8E;<code>nextFlushedExpirationTime</code></em>&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x5224;&#x65AD;&#x4EFB;&#x52A1;&#x662F;&#x5426;&#x5DF2;&#x7ECF;&#x8D85;&#x65F6;&#x4E86;&#x4E86;&#xFF0C;&#x5982;&#x679C;&#x8D85;&#x65F6;&#x4E86;&#xFF0C;&#x6839;&#x636E;&#x4E0B;&#x9762;&#x8C03;&#x7528;<code>performWorkOnRoot</code>&#x7684;&#x53C2;&#x6570;&#x4E2D;&#x6709;&#x4E00;&#x4E2A;<code>currentRendererTime &gt;= nextFlushedExpirationTime</code>&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4E0B;&#x4E3A;<code>true</code>&#xFF0C;&#x4EE3;&#x8868;&#x7684;&#x610F;&#x601D;&#x662F;&#x540C;&#x6B65;&#x6267;&#x884C;&#x4EFB;&#x52A1;&#x4E0D;&#x518D;&#x5224;&#x65AD;&#x662F;&#x5426;&#x65F6;&#x95F4;&#x7247;&#x5230;&#x671F;&#x3002;</p><h5 id="&#x6536;&#x5C3E;">&#x6536;&#x5C3E;</h5><p>&#x6700;&#x540E;&#x5982;&#x679C;&#x8DF3;&#x51FA;&#x5FAA;&#x73AF;&#xFF0C;&#x6709;&#x4E24;&#x79CD;&#x53EF;&#x80FD;&#xFF0C;&#x4E00;&#x662F;&#x4EFB;&#x52A1;&#x5DF2;&#x7ECF;&#x5B8C;&#x6210;&#xFF0C;&#x4E00;&#x662F;&#x65F6;&#x95F4;&#x7247;&#x7528;&#x5B8C;&#x4E86;&#x5E76;&#x4E14;&#x4EFB;&#x52A1;&#x6CA1;&#x8FC7;&#x671F;&#x3002;&#x5BF9;&#x4E8E;&#x7B2C;&#x4E8C;&#x79CD;&#x60C5;&#x51B5;&#x4F1A;&#x91CD;&#x65B0;&#x53D1;&#x8D77;&#x4E00;&#x6B21;&#x5F02;&#x6B65;&#x8C03;&#x5EA6;&#xFF0C;&#x7B49;<code>requestIdleCallback</code>&#x6709;&#x7A7A;&#x4E86;&#x518D;&#x56DE;&#x6765;&#x7EE7;&#x7EED;&#x6267;&#x884C;&#x3002;</p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">performAsyncWork</span>(<span class="hljs-params">dl</span>) </span>{
  <span class="hljs-keyword">if</span> (dl.didTimeout) {
    <span class="hljs-keyword">if</span> (firstScheduledRoot !== <span class="hljs-literal">null</span>) {
      recomputeCurrentRendererTime()
      <span class="hljs-keyword">let</span> root: FiberRoot = firstScheduledRoot
      <span class="hljs-keyword">do</span> {
        didExpireAtExpirationTime(root, currentRendererTime)
        <span class="hljs-comment">// The root schedule is circular, so this is never null.</span>
        root = (root.nextScheduledRoot: any)
      } <span class="hljs-keyword">while</span> (root !== firstScheduledRoot)
    }
  }
  performWork(NoWork, dl)
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">performSyncWork</span>(<span class="hljs-params"></span>) </span>{
  performWork(Sync, <span class="hljs-literal">null</span>)
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">performWork</span>(<span class="hljs-params">minExpirationTime: ExpirationTime, dl: Deadline | null</span>) </span>{
  deadline = dl

  <span class="hljs-comment">// Keep working on roots until there&apos;s no more work, or until we reach</span>
  <span class="hljs-comment">// the deadline.</span>
  findHighestPriorityRoot()

  <span class="hljs-keyword">if</span> (deadline !== <span class="hljs-literal">null</span>) {
    recomputeCurrentRendererTime()
    currentSchedulerTime = currentRendererTime

    <span class="hljs-keyword">if</span> (enableUserTimingAPI) {
      <span class="hljs-keyword">const</span> didExpire = nextFlushedExpirationTime &lt; currentRendererTime
      <span class="hljs-keyword">const</span> timeout = expirationTimeToMs(nextFlushedExpirationTime)
      stopRequestCallbackTimer(didExpire, timeout)
    }

    <span class="hljs-keyword">while</span> (
      nextFlushedRoot !== <span class="hljs-literal">null</span> &amp;&amp;
      nextFlushedExpirationTime !== NoWork &amp;&amp;
      (minExpirationTime === NoWork ||
        minExpirationTime &gt;= nextFlushedExpirationTime) &amp;&amp;
      (!deadlineDidExpire || currentRendererTime &gt;= nextFlushedExpirationTime)
    ) {
      performWorkOnRoot(
        nextFlushedRoot,
        nextFlushedExpirationTime,
        currentRendererTime &gt;= nextFlushedExpirationTime,
      )
      findHighestPriorityRoot()
      recomputeCurrentRendererTime()
      currentSchedulerTime = currentRendererTime
    }
  } <span class="hljs-keyword">else</span> {
    <span class="hljs-keyword">while</span> (
      nextFlushedRoot !== <span class="hljs-literal">null</span> &amp;&amp;
      nextFlushedExpirationTime !== NoWork &amp;&amp;
      (minExpirationTime === NoWork ||
        minExpirationTime &gt;= nextFlushedExpirationTime)
    ) {
      performWorkOnRoot(nextFlushedRoot, nextFlushedExpirationTime, <span class="hljs-literal">true</span>)
      findHighestPriorityRoot()
    }
  }

  <span class="hljs-comment">// We&apos;re done flushing work. Either we ran out of time in this callback,</span>
  <span class="hljs-comment">// or there&apos;s no more work left with sufficient priority.</span>

  <span class="hljs-comment">// If we&apos;re inside a callback, set this to false since we just completed it.</span>
  <span class="hljs-keyword">if</span> (deadline !== <span class="hljs-literal">null</span>) {
    callbackExpirationTime = NoWork
    callbackID = <span class="hljs-literal">null</span>
  }
  <span class="hljs-comment">// If there&apos;s work left over, schedule a new callback.</span>
  <span class="hljs-keyword">if</span> (nextFlushedExpirationTime !== NoWork) {
    scheduleCallbackWithExpirationTime(
      ((nextFlushedRoot: any): FiberRoot),
      nextFlushedExpirationTime,
    )
  }

  <span class="hljs-comment">// Clean-up.</span>
  deadline = <span class="hljs-literal">null</span>
  deadlineDidExpire = <span class="hljs-literal">false</span>

  finishRendering()
}</code></pre>
</div></div></div>



<h1 id="performworkonroot">performWorkOnRoot</h1><div class="api-method"><div class="api-method-definition"><p>&#x8FD9;&#x91CC;&#x4E5F;&#x5206;&#x4E3A;&#x540C;&#x6B65;&#x548C;&#x5F02;&#x6B65;&#x4E24;&#x79CD;&#x60C5;&#x51B5;&#xFF0C;&#x4F46;&#x662F;&#x8FD9;&#x4E24;&#x79CD;&#x60C5;&#x51B5;&#x7684;&#x533A;&#x522B;&#x5176;&#x5B9E;&#x975E;&#x5E38;&#x5C0F;&#x3002;</p><p>&#x9996;&#x5148;&#x662F;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x7684;&#x533A;&#x522B;&#xFF0C;<code>isYieldy</code>&#x5728;&#x540C;&#x6B65;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#x662F;<code>false</code>&#xFF0C;&#x800C;&#x5728;&#x5F02;&#x6B65;&#x60C5;&#x51B5;&#x4E0B;&#x662F;<code>true</code>&#x3002;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;&#x987E;&#x540D;&#x601D;&#x4E49;&#x5C31;&#x662F;<em>&#x662F;&#x5426;&#x53EF;&#x4EE5;&#x4E2D;&#x65AD;</em>&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x4E2A;&#x533A;&#x522B;&#x4E5F;&#x5C31;&#x5F88;&#x597D;&#x7406;&#x89E3;&#x4E86;&#x3002;</p><p>&#x7B2C;&#x4E8C;&#x4E2A;&#x533A;&#x522B;&#x5C31;&#x662F;&#x5728;<code>renderRoot</code>&#x4E4B;&#x540E;&#x5224;&#x65AD;&#x4E00;&#x4E0B;<code>shouldYeild</code>&#xFF0C;&#x5982;&#x679C;&#x65F6;&#x95F4;&#x7247;&#x5DF2;&#x7ECF;&#x7528;&#x5B8C;&#xFF0C;&#x5219;&#x4E0D;&#x76F4;&#x63A5;<code>completeRoot</code>&#xFF0C;&#x800C;&#x662F;&#x7B49;&#x5230;&#x4E00;&#x4E0B;&#x6B21;<code>requestIdleCallback</code>&#x4E4B;&#x540E;&#x518D;&#x6267;&#x884C;&#x3002;</p><p><code>renderRoot</code>&#x548C;<code>completeRoot</code>&#x5206;&#x522B;&#x5BF9;&#x5E94;&#x4E24;&#x4E2A;&#x9636;&#x6BB5;&#xFF1A;</p><ul><li>&#x6E32;&#x67D3;&#x9636;&#x6BB5;
</li>
<li>&#x63D0;&#x4EA4;&#x9636;&#x6BB5;
</li></ul>
<p>&#x6E32;&#x67D3;&#x9636;&#x6BB5;&#x53EF;&#x4EE5;&#x88AB;&#x6253;&#x65AD;&#xFF0C;&#x800C;&#x63D0;&#x4EA4;&#x9636;&#x6BB5;&#x4E0D;&#x80FD;</p></div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">performWorkOnRoot</span>(<span class="hljs-params">
  root: FiberRoot,
  expirationTime: ExpirationTime,
  isExpired: boolean,
</span>) </span>{
  isRendering = <span class="hljs-literal">true</span>

  <span class="hljs-keyword">if</span> (deadline === <span class="hljs-literal">null</span> || isExpired) {
    <span class="hljs-keyword">let</span> finishedWork = root.finishedWork
    <span class="hljs-keyword">if</span> (finishedWork !== <span class="hljs-literal">null</span>) {
      <span class="hljs-comment">// This root is already complete. We can commit it.</span>
      completeRoot(root, finishedWork, expirationTime)
    } <span class="hljs-keyword">else</span> {
      root.finishedWork = <span class="hljs-literal">null</span>
      <span class="hljs-keyword">const</span> timeoutHandle = root.timeoutHandle
      <span class="hljs-keyword">if</span> (enableSuspense &amp;&amp; timeoutHandle !== noTimeout) {
        root.timeoutHandle = noTimeout
        cancelTimeout(timeoutHandle)
      }
      <span class="hljs-keyword">const</span> isYieldy = <span class="hljs-literal">false</span>
      renderRoot(root, isYieldy, isExpired)
      finishedWork = root.finishedWork
      <span class="hljs-keyword">if</span> (finishedWork !== <span class="hljs-literal">null</span>) {
        <span class="hljs-comment">// We&apos;ve completed the root. Commit it.</span>
        completeRoot(root, finishedWork, expirationTime)
      }
    }
  } <span class="hljs-keyword">else</span> {
    <span class="hljs-comment">// Flush async work.</span>
    <span class="hljs-keyword">let</span> finishedWork = root.finishedWork
    <span class="hljs-keyword">if</span> (finishedWork !== <span class="hljs-literal">null</span>) {
      <span class="hljs-comment">// This root is already complete. We can commit it.</span>
      completeRoot(root, finishedWork, expirationTime)
    } <span class="hljs-keyword">else</span> {
      root.finishedWork = <span class="hljs-literal">null</span>
      <span class="hljs-comment">// If this root previously suspended, clear its existing timeout, since</span>
      <span class="hljs-comment">// we&apos;re about to try rendering again.</span>
      <span class="hljs-keyword">const</span> timeoutHandle = root.timeoutHandle
      <span class="hljs-keyword">if</span> (enableSuspense &amp;&amp; timeoutHandle !== noTimeout) {
        root.timeoutHandle = noTimeout
        <span class="hljs-comment">// $FlowFixMe Complains noTimeout is not a TimeoutID, despite the check above</span>
        cancelTimeout(timeoutHandle)
      }
      <span class="hljs-keyword">const</span> isYieldy = <span class="hljs-literal">true</span>
      renderRoot(root, isYieldy, isExpired)
      finishedWork = root.finishedWork
      <span class="hljs-keyword">if</span> (finishedWork !== <span class="hljs-literal">null</span>) {
        <span class="hljs-keyword">if</span> (!shouldYield()) {
          <span class="hljs-comment">// Still time left. Commit the root.</span>
          completeRoot(root, finishedWork, expirationTime)
        } <span class="hljs-keyword">else</span> {
          root.finishedWork = finishedWork
        }
      }
    }
  }

  isRendering = <span class="hljs-literal">false</span>
}</code></pre>
</div></div></div>



<div class="api-method"><div class="api-method-definition"><h1 id="findhighestpriorityroot">findHighestPriorityRoot</h1><p>&#x4E00;&#x822C;&#x60C5;&#x51B5;&#x4E0B;&#x6211;&#x4EEC;&#x7684; React &#x5E94;&#x7528;&#x53EA;&#x4F1A;&#x6709;&#x4E00;&#x4E2A;<code>root</code>&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x91CC;&#x7684;&#x5927;&#x90E8;&#x5206;&#x903B;&#x8F91;&#x5176;&#x5B9E;&#x90FD;&#x4E0D;&#x662F;&#x5E38;&#x89C1;&#x60C5;&#x51B5;</p><p>&#x5FAA;&#x73AF;<code>firstScheduledRoot =&gt; lastScheduledRoot</code>&#xFF0C;<code>remainingExpirationTime</code>&#x662F;<code>root.expirationTime</code>&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x6700;&#x65E9;&#x7684;&#x8FC7;&#x671F;&#x65F6;&#x95F4;&#x3002;</p><p>&#x5982;&#x679C;&#x4ED6;&#x662F;<code>NoWork</code>&#x8BF4;&#x660E;&#x4ED6;&#x5DF2;&#x7ECF;&#x6CA1;&#x6709;&#x4EFB;&#x52A1;&#x4E86;&#xFF0C;&#x4ECE;&#x94FE;&#x8868;&#x4E2D;&#x5220;&#x9664;&#x3002;</p><p>&#x4ECE;&#x5269;&#x4E0B;&#x7684;&#x4E2D;&#x627E;&#x5230;<code>expirationTime</code>&#x6700;&#x5C0F;&#x7684;&#x4E5F;&#x5C31;&#x662F;&#x4F18;&#x5148;&#x7EA7;&#x6700;&#x9AD8;&#x7684;<code>root</code>&#x7136;&#x540E;&#x628A;&#x4ED6;&#x8D4B;&#x503C;&#x7ED9;<code>nextFlushedRoot</code>&#x5E76;&#x628A;&#x4ED6;&#x7684;<code>expirationTime</code>&#x8D4B;&#x503C;&#x7ED9;<code>nextFlushedExpirationTime</code>&#x8FD9;&#x4E24;&#x4E2A;&#x516C;&#x5171;&#x53D8;&#x91CF;&#x3002;</p><p>&#x4E00;&#x822C;&#x6765;&#x8BF4;&#x4F1A;&#x76F4;&#x63A5;&#x6267;&#x884C;&#x4E0B;&#x9762;&#x8FD9;&#x4E2A;&#x903B;&#x8F91;</p><pre><code class="lang-js"><span class="hljs-keyword">if</span> (root === root.nextScheduledRoot) {
  <span class="hljs-comment">// This is the only root in the list.</span>
  root.nextScheduledRoot = <span class="hljs-literal">null</span>;
  firstScheduledRoot = lastScheduledRoot = <span class="hljs-literal">null</span>;
  <span class="hljs-keyword">break</span>;
}</code></pre>
</div><div class="api-method-code"><div class="api-method-sample" data-lang="js" data-name="JavaScript"><pre><code class="lang-js"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">findHighestPriorityRoot</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">let</span> highestPriorityWork = NoWork
  <span class="hljs-keyword">let</span> highestPriorityRoot = <span class="hljs-literal">null</span>
  <span class="hljs-keyword">if</span> (lastScheduledRoot !== <span class="hljs-literal">null</span>) {
    <span class="hljs-keyword">let</span> previousScheduledRoot = lastScheduledRoot
    <span class="hljs-keyword">let</span> root = firstScheduledRoot
    <span class="hljs-keyword">while</span> (root !== <span class="hljs-literal">null</span>) {
      <span class="hljs-keyword">const</span> remainingExpirationTime = root.expirationTime
      <span class="hljs-keyword">if</span> (remainingExpirationTime === NoWork) {
        <span class="hljs-comment">// This root no longer has work. Remove it from the scheduler.</span>

        <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> This check is redudant, but Flow is confused by the branch</span>
        <span class="hljs-comment">// below where we set lastScheduledRoot to null, even though we break</span>
        <span class="hljs-comment">// from the loop right after.</span>
        invariant(
          previousScheduledRoot !== <span class="hljs-literal">null</span> &amp;&amp; lastScheduledRoot !== <span class="hljs-literal">null</span>,
          <span class="hljs-string">&apos;Should have a previous and last root. This error is likely &apos;</span> +
            <span class="hljs-string">&apos;caused by a bug in React. Please file an issue.&apos;</span>,
        )
        <span class="hljs-keyword">if</span> (root === root.nextScheduledRoot) {
          <span class="hljs-comment">// This is the only root in the list.</span>
          root.nextScheduledRoot = <span class="hljs-literal">null</span>
          firstScheduledRoot = lastScheduledRoot = <span class="hljs-literal">null</span>
          <span class="hljs-keyword">break</span>
        } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (root === firstScheduledRoot) {
          <span class="hljs-comment">// This is the first root in the list.</span>
          <span class="hljs-keyword">const</span> next = root.nextScheduledRoot
          firstScheduledRoot = next
          lastScheduledRoot.nextScheduledRoot = next
          root.nextScheduledRoot = <span class="hljs-literal">null</span>
        } <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (root === lastScheduledRoot) {
          <span class="hljs-comment">// This is the last root in the list.</span>
          lastScheduledRoot = previousScheduledRoot
          lastScheduledRoot.nextScheduledRoot = firstScheduledRoot
          root.nextScheduledRoot = <span class="hljs-literal">null</span>
          <span class="hljs-keyword">break</span>
        } <span class="hljs-keyword">else</span> {
          previousScheduledRoot.nextScheduledRoot = root.nextScheduledRoot
          root.nextScheduledRoot = <span class="hljs-literal">null</span>
        }
        root = previousScheduledRoot.nextScheduledRoot
      } <span class="hljs-keyword">else</span> {
        <span class="hljs-keyword">if</span> (
          highestPriorityWork === NoWork ||
          remainingExpirationTime &lt; highestPriorityWork
        ) {
          <span class="hljs-comment">// Update the priority, if it&apos;s higher</span>
          highestPriorityWork = remainingExpirationTime
          highestPriorityRoot = root
        }
        <span class="hljs-keyword">if</span> (root === lastScheduledRoot) {
          <span class="hljs-keyword">break</span>
        }
        <span class="hljs-keyword">if</span> (highestPriorityWork === Sync) {
          <span class="hljs-comment">// Sync is highest priority by definition so</span>
          <span class="hljs-comment">// we can stop searching.</span>
          <span class="hljs-keyword">break</span>
        }
        previousScheduledRoot = root
        root = root.nextScheduledRoot
      }
    }
  }

  nextFlushedRoot = highestPriorityRoot
  nextFlushedExpirationTime = highestPriorityWork
}</code></pre>
</div></div></div>



<p>&#x4E0B;&#x4E00;&#x7BC7;&#xFF1A;<a href="render-root.html"><code>renderRoot</code></a></p>
                                
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